Constant-pressure regulator



Aug- 3 L. R UFF CONSTANT PRESSURE REGULATOR Filed NOV. 23, 1925 EVQ" k aRN 1 \i a: M q

m e: '3 J 21 B if 3 recess R Patented Aug. 3, 19 26.

UNITED stares PATENT orrics.

LESLIE R. HUFF, 0F PHILLIPSBUR-G, NEW JERSEY, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITYfNEW' JERSEY, A CORPORATION OF NEWJERSEY.

CONSTANT-PRESSURE REGULATOR.

Application filed November 23, 1925. Serial No. 70,878.

This invention relates to pressure regulators, but more particularly toa constant pressure regulator for a motor driven turbo compressor inwhich discharge pressure from the compressor is utilized for regulatingthe delivery of power to the mo-tor.,

The objects of the invention are to maintain constant discharge pressurefrom the turbo compressor and to prevent over speeding of the motor.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention consists of the combinations of elements, features ofconstruction and arrangement of parts having the general mode ofoperation substantially as hereinafter i described and more particularlypointed out in the appended claims and illustrated in the accompanyingdrawing.

he figure in the drawing is an elevation in section of a constantpressure regulator applied to a turbo compressor.

Referring to the drawing, a turbo compressor A viewed from the steam endis provided with a discharge pipe B and is mounted on a foundation C. Asteam pipe D leading from a source. of supply is adapted to convey steamto the motor of'the turbo compressor and has a valve chest E providedwith a reciprocatory valve F for regulatingthe admission of steam to themotor of the compressor.

A cover G is mounted on a base H to form a chamber J. The cover G may besecured to the base H in any suitable manner, and ms formed integrallytherewith at its top a cylinder K in which is adapted to reciprocate aregulator piston L, against a face 0 of which may act pressure fluid,such as oil, admitted into a chamber P by a control valve The upper orouter end of the cylinder K is preferably recessed as at R to receiveany oil which may leak past the piston L, and a passage S leading fromthe to a drain passage T formed in the cover G and the base H provides apath for such leakage oil. V

In order to adjust the control valve Q so that a suitable pressure maybe maintained within the chamber P at all times to tend to force thepiston L outwardly, a compression spring U is arranged to act againstthe upper end of the valve Q and bears at its upper end against anadjusting spindle V. The adjusting spindle V is preferably in the formof a screw and has a hand wheel W for manipulating the spindle V toadjust the tension of the spring U for different d scharge pressuresthrough the discharge pipe B. i

In this instance fluid under pressure, as for instance oil, is conveyedfrom a suitable source of supply through a pipe X into an annular grooveY formed in the valve casing Z. The annular groove Y encircles thesleeve 7) which is adapted to receive the valve Q and is provided wit-ha plurality of ports 0 in constant communication with the groove Y. Thevalve Q is preferably provided with a hollow bore (Z which extendspartly throughout its length and is adapted to communicate with theports 0 inthe sleeve Z) through a plurality of radial ports e.

To provide for the escape ofoil in case of excessive pressure againstthe valve Q, a

series of ports 7 are formed in the sleeve 6 above the ports a toregister with an annular groove 9 formed in the valve casing Z. A pipe72 connected at one end to communicate with the groove 9 and at itsother end with the drain passage T provides a convenient means forcarrying off the oil by-passed through the valve Q.

Mounted on the valve casing E is a bracket j which supports a cylinderis. A piston 0 is arranged to reciprocate within the cylinder is and isprovided at its upper end witha rod 29 slidable through a-Vguide q andsecured pivotally at its outer end with a balancing lever 1", whichlever is pivoted at its other end to a governor lever s mountedpivotally on a link If. A piston red at in this instance forms aconnection between the valve F and the piston 0.

Formed integrally with the cylinder is is a valve chest 1) provided witha ported sleeve 20 which serves as a guide for a pilot valve 00. Thepilot valve 00 is provided in this instance with heads g and z andextends outwardly through the valve chest to connect pivotally with thebalancing lever 7*, preferably intermediate the ends of said balancinglever as at 2. A

.3 and 4 in this instance lead fro-m the top and bot-tom ends of thecylinder is to the sleeve w and are controlled by the heads a and grespectively "of the valve w. Formed in the sleeve 20 between thepassages 3 and 4 is a port 5 which afiords communication bepair ofpassages tween the interior of the sleeve 10 and a chamber 6 having aconnection 7 through wnich pressure fluid, such as oil, may be admittedinto said chamber from a source of supply.

In order that any oil which may be ad'- mitted into the ends of thecylinder 70 may be readily exhausted therefrom to the drain passage T, aport 8 is formed in the sleeve 10 above the passage 3. The port 8communicates with a passage 9 leaning to a port 10 which registers witha port 12 opening into the drain passage T.

Inaccordance with the present invention, a head 13 supported by thecover G carries a corrugated collapsible diaphragm or sylphon 1a. Thesylphon 1 1 in this instance is provided at its lower end with a movablehead 15to which are secured on opposite sides rods or bolts 16. Thebolts 16 extend upwardly into a chamber 17 and are secured to a yoke 18extending transversely through the chamber 17. Intermediate the bolts16, a rod 19 is secured at one end to the yoke 18 and extends upwardlythrough a sleeve 20 supported by the cover G and through the regulatorpiston L to connect pivotally with an arm 21 pivoted on a bracket 22 andextending beyond the bracket to connect with thelink t; The rod 19 ispreferably secured fixedly to the piston L as by means of a nut 23. Thebore of the sleeve 20 is preferably of sufficient. diameter so thatcontact between it and the rod 19 will be prevented. The sleeve 20serves to prevent leakage of oil into the chamber 17 and also to preventexcessive leakage of oil into the interior or.

the piston L. I

In the present instance a speed governor 24 adapted tobe connected tothe motor is operatively connected to one end of the gov ernor lever s.A pipe 25 connected at one end to the discharge pipe B is connected atthe head 13 for conveyits other end with ing discharge pressure fluidfrom the pipe B to the interior ot the sylphon 1 1. In order to preventlateral movement of the free end of the sylphon 1 1, a pin 26 is securedto the head 15 and extends slidably into a bore 27 in the bottom of thebase II whereby said pin is guided.

If desired, a recess 28 may be formed in the top of the piston 0 toreceive a spring 29which will tend to constantly force the piston 0downwardly. In this way the pressure of the oil admitted into the top ofthe cylinder K will be augmented for closing the valve F.

The operation of the device is as follows: Assuming that the compressoris running at normal speed, and that pressure fluid is therefore beingexhausted through the dis charge pipe B, a portion of the pressurefluidwill' flow through the pipe 25 into the sylphon 1 1 and actingagainst the head 15 will tend to move said head downwardly to wards thebottom of the base H. With the turbo compressor A running at normalspeed, the pressure of the oil entering the chamber P will. also haveattained its maximum pressure and acting against the bottom of thepiston. L will tend to force the piston up man and thus tend tocounterbalance the torce of the pressure fluid acting against the head15 of the sylphon 1 1-. During the time that the forces acting againstthe head 15 of the sylph'on and against the piston L are equal, thevalve Q will remain approximately in the position indi ated in thedrawing, that is, the port c will be in registration with the ports 6 sothat the piston Ii will be exposed directly to the 'f'ullline pressureof the oil. It in case the pressure acting against the head 15 ot thesylphon is suliiciently great to overcomethe pressure acting againsttheface 0 of the piston L, said piston will be moved downwardly displacingsome of the oil in the chamber I. The oil thus displaced will force thevalve Q upwardly until the ports 6 register with the ports and a portionoi the oil will pass into the drain passage '1 through the pipe h.

As the discharge pressure in the pipe B increases, the increasedpressure acting against the head 15 will force said head downwardlytogether with the bolts and ods connecting said head with the lever 21.The lever 21 will then be rocked about its pivot and will in consequencerock the governor lever s and the balancing leverw to raisethe pilotvalve x. As the pilot valve 00 is raised, the passage 3 will be placedin communication with the chamber 6 and oil will flow from said chamberto the top of the cylinder 76. The oil thus admitted will act againstthe piston 0 and force said piston downwardly, and valve 00. In this waythe steam flow to the motor of the turbo compressor A will'be reduced,as well as the discharge pressure from the compressor. With thedecreased discharge pressure in the pipe B and therefore in the sylphon14, the pressure acting against thepiston L may then be greater than thedischarge pressure from the compressor and will force said pistonupwardly. Such movement of the piston L will move the pilot valvedownwardly in the sleeve w and establish communication between thechamber 6 and the passage 4. With the pilot valve 00 in this position,oil will flow from the chamber 6 beneath the piston 0 and again'open thevalve F. Movement of the pilot valve 00 towards either of its openpositions whereby oil will be admitted into one end of the cylinder iswill also establish communication between-the opposite end of saidcylinder and the passages leading to the drain passage T, so

thus tending to close the V of said cylinder by the pressure face of thepisthat any oil in either end may be forced therefrom acting against theopposite ton 0.

Overspeeding of the motor which drives the compressor is at all timesprevented by the governor 24 which, being connected to operate the valve00, will at certain speeds of the motor rock the lever s and thebalancing lever r to open the pilot valve w, and thus admit oil underpressure into the cylinder is as hereinbefore described. The governor24: also controls the admission of steam to the motor when said motor isfirst being started and before sufficient discharge pres sure is builtup to set the sylphon 14 in operation.

I claim:

1. A pressure regulator for motor driven turbo-compressors, comprising aframe, a corrugated collapsible diaphragm connected at one end to theframe and having a movable head at the other end, guiding means for saidmovable head, bolts secured to the movable head, a yoke connecting saidbolts, an operating rod extending from said yoke and adapted to beconnected to regulating mechanism, and a pressure fluid connectionbetween the discharge of the turbo-compressor and the diaphragm, wherebythe diaphragm is subject to discharge pressure for regulating purposes.

2. A pressure regulator for motor driven turbo-compressors and the like,comprising a base having a chamber therein, a cover for the base, a headsupported inside the cover, a corrugated collapsible diaphragm connectedat one end to the cover, a movable head at the other end, of thediaphragm, a guide pin on said head guided in the base, bolts secured atopposite sides to said movable head, a yoke connecting the rods withinthe cover, a rod extending from the yoke and adapted to be operativelyconnected to regulating mechanism, and a pipe connection between thedischarge of the turbo-compressor and the inside of the collapsiblediaphragm, whereby the diaphragm is subject to discharge pressure forregulating purposes.

In testimony whereof I have signed this specification.

LESLIE R. HUFF.

